Hi! Thank you 😊 Your message was very helpful! The main reason why “ceph df“ went to “100% USAGE” was because of the crush rule said this: "min_size": 2 "max_size": 2 And the new “size” was 3, so the rule did not want to work with the pool. After creating a new rule and setting the pools to this new rule, it seems to work (in our test cluster) rule newrule { ruleset 4 type replicated min_size 3 max_size 3 step take default step choose firstn 2 type room step chooseleaf firstn 2 type host step emit } Thanks again! Further testing now 😊 ________________________________ BearingPoint GmbH Sitz: Wien Firmenbuchgericht: Handelsgericht Wien Firmenbuchnummer: FN 175524z The information in this email is confidential and may be legally privileged. If you are not the intended recipient of this message, any review, disclosure, copying, distribution, retention, or any action taken or omitted to be taken in reliance on it is prohibited and may be unlawful. If you are not the intended recipient, please reply to or forward a copy of this message to the sender and delete the message, any attachments, and any copies thereof from your system.